Publication 1404-UM001D-EN-E - October 2004
4-4 Communications
• Flow Control: Enables or disables hardware handshaking.
Default disabled
• Inter-character timeout: Range 0 to 6553 msec. Default 0 (= 3.5
character times)
To change your RS-232 port configuration, use the Display Module
under the PROGRAM > OPTIONAL COMMUNICATIONS menu.
The RS-232 communications standard supports point-to-point
communications between 2 stations or nodes, with a maximum cable
length of 15.24 meters (50.0 ft.). As does the native communications
port, the RS-232 port uses CRC error checking. You may not use the
optional RS-232 port and the native RS-485 port at the same time.
Table 4.2 Optional RS-232 Communications Configuration Summary
Parameter Description Range Default User
Setting
Port Select active serial port RS-232
RS-485
RS-232
Protocol DF1 Half-Duplex
Slave
Modbus RTU
Slave
Auto-Sense
Auto-Sense
Delay Time between receiving a
request and transmitting
a response
0 to 75 mS 10 mS
Baud Rate RS-485 port
communications bit rate
1200 baud
2400 baud
4800 baud
9600 baud
19200 baud
9600 baud
Node Address Uniquely identifies the
Powermonitor device on
a multi-drop network
1 to 247 Unit ID
number
Data Format Data bits / Stop bits /
Parity
8 / 1/ none
8 / 1/ even
8 / 1/ odd
8 / 1 / none
Flow Control
(Handshaking)
RS-232 hardware flow
control
0 - none
1 - RTS/CTS
0 - none
Inter-Character
Timeout
Mimimum delay between
characters that indicates
end of Modbus message
packet
0 to 6553 ms 0 (= 3.5
character
times)
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